Abstract

Ultrathin nanocrystallinefilms with (111) spinel texture have been prepared by rapid annealing of amorphous ion oxide films. Large low field magnetoresistance (LFMR), with the values of about at and at under a field of , has been observed in the films. The LFMR is mainly attributed to the boundary tunneling of high spin-polarized electrons in grains of the films and nearly follows a simple relationship between MR and polarization for intergranular tunneling. The fabricating method here seems to be a good approach to prepare high quality nanocrystallinefilms with a large LFMR at room temperature.

Received 09 July 2007Accepted 16 August 2007Published online 07 September 2007

Acknowledgments:

The work described in this letter was supported by the following grants: National Key Program for the Fundamental Research Development Plan of China (973 Project No. 2005CB623605), National Science Foundation of China (NSFC Grant Nos. 10374044 and 10474037), Cyanine-Project Foundation from Jiangsu Province of China (Grant No. 1107020060), and National Science Foundation of Jiangsu Province of China (Grant No. BK2007118).